Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"dipole-dipole interaction"”.
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Resonant Dipole-Dipole Energy Transfer Dynamics in a Frozen Rydberg Gas
<p>The dipole-dipole interaction strongly couples ultracold highly excited atoms, known as Rydberg atoms, and is the dominant mechanism for energy exchange among such atoms on microsecond time scales. I present the results of experiments that investigate this interaction using rubidium atoms …
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Super-resolution Control of Ultracold Dipolar Atoms on a 50-nm Scale
… large spin degree of freedom and long-range dipole-dipole interactions. In this thesis, following an introduction to the fundamental properties of Dy, we introduce the design and construction of an experimental apparatus that is capable of producing Bose-Eintein codensates of more than 10⁵ Dy …
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Dipolar Shielding and Sub-wavelength Bilayers in a Quantum Gas of Dysprosium
In our paper Can the Dipolar Interaction Suppress Dipolar Relaxation?, by using magnetic dysprosium atoms and an optical lattice we engineered the dipolar suppression of dipolar relaxation in an ultra-cold gas prepared in an excited Zeeman level. The atoms were confined to ultra-thin layers, with …
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Spectroscopic studies of some heterocyclic hydrazones and their metal complexes
… atoms, whereas the Z-isomer association is a dipole-dipole interaction involving the aldehyde ring of different PAPHY molecules. Evidence from long range coupling shows that the uncomplexed E and Z-PAPHY molecules possess a different configuration to the complexed molecules. The chemical shift …
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Theory of phase transitions in liquid crystals and plastic crystals
… of freedom within each smectic plane. McMillan's dipole-dipole interaction model is extended to include intermolecular repulsions. In the self-consistent field approximation there are three ordered phases: the smectic C phase in which molecules are rotationally ordered but free to translate …
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Optical cooling using the dipole force
… theory that can be used to explain the interaction between light and matter at a very general level. I use this 'transfer matrix' formalism to explore the use of the retarded dipole-dipole interaction as a means of both enhancing the efficiency of micromirror cooling systems and …
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Phase Transitions in Dipole-Dipole Interacting Atomic Systems
… physics of phase transitions, one needs interactions between the microscopic constituents. In this thesis, the phase transitions of atomic systems with interparticle dipole-dipole interaction controlled by laser fields are studied. In the first half of the thesis, a system with externally …
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Non-equilibrium dynamics of dipole-coupled internal states in cold gases
… behaving as spin$-1/2$ models with long-range interactions. We first study a closed system with both static and resonant near-field dipole interactions under an external drive. By studying the uniform mean-field dynamics of the system, we find the dynamics are given by Rabi oscillations, with a …
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Investigating the Unique Mechanism of Action of CADA Analogs for Down-Modulating CD4, Sortilin, and ACE2
… may bind with the hCD4 signal peptide through a dipole-dipole interaction between the N,N-dimethylaminobenzenesulfonyl side-arm of CK147 and the amide side chain of glutamine (Q-15) of hCD4 SP, forming a folded conformation similar to the transitory state during translocation. It was also …
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Multiscale approaches on two-dimensional magnetic materials: from atomistic to mesoscale level
… new avenues in the study of fundamental spin interactions in two dimensions (2D). Such developments allow us to assess whether magnetism in 2D is a smooth continuation from low-dimensional magnetic materials, or if new physics and magnetic behaviour arise due to the reduced …
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Experimental Studies of LiRb: Spectroscopy and Ultracold Molecule Formation by Photoassociation
… to their ground state having a large electric dipole moment. The long range anisotropic dipole-dipole interaction in such systems is the basis for a variety of applications including quantum computing, precision measurements, ultracold chemistry and quantum simulations. Heteronuclear bi-alkali …
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Controlled Attachment of Nanoparticles to Layered Oxides
… magnetic chain structures, formed due to the dipole-dipole interaction, were captured within scrolled lamella. The yield of peapod structures can be improved by using proper reagents and reaction temperatures. As similar method with iron oxide NPs also produced peapod-like structures in a low …
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High resolution NMR scattering : the first measurement of spin diffusion rates in a homogeneous solid
… with the flip-flop term of the homonuclear dipole-dipole interaction. Since the microscopic motion driven by di- polar coupling is very slow, only fine magnetization gratings are sensitive to the small spatial offsets. Strong pulsed magnetic field gradient techniques were developed for …
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Pulsed field gradient magnetic resonance measurements of lithium-ion diffusion
… where strong relaxation due to the homonuclear dipole-dipole interaction drastically shortens coherence times and thus limits the duration of applied gradient pulses. This study utilizes a magic echo based refocusing sequence to nullify the dominant decoherence mechanism allowing effective …
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The importance of the antiperiplanar effect in the nucleophilic addition of hydride to a carbonyl group.
… the varying strength in the van der Waals interaction between the carbonyl group and the 2-equatorial substituent. Our competitive reduction rate study has demonstrated with the aid of log ($\rm k\sb{R}\sp{app}/k\sb{H})$ and ($\rm k\sb{R}\sp{ac}/k\sb{H})$ versus $\sigma\sb1$ plots that the …
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Desarrollo de composites magnetostrictivos de FeAl y FeGa para su aplicación en sensores de deformación
… effect) which are: a magnetic one, due to the dipole-dipole interaction of the magnetic particles, and another mechanical one, due to the easy deformation of the elastomeric materials. It has been found that when the isotropic composites (random orientation of the magnetic particles) undergo a …
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Quantum computing with naturally trapped sub-nanometre-spaced ions
… they are well shielded, through a permanent dipole-dipole interaction. This interaction can be turned on and off by switching between two different ways of encoding the qubit, a most useful feature. When the qubit is represented as a superposition between two ground state hyperfine levels, …
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Exploring Multiple Hydrogen Bonding and Ionic Bonding in the Design of Supramolecular Polymers
… that are held together with dynamic, noncovalent interactions. In contrast to conventional functional polymers that usually have high melt-viscosity due to their covalent nature and chain entanglement, supramolecular polymers combine excellent physical properties with low melt-viscosity, allowing …
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High pressure NMR studies of disordered materials
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